Shouldn't def functions be prohibited in legacy vimscript?

https://vi.stackexchange.com/questions/36829/how-can-i-define-vim9-functions-and-vim9-lambdas-in-a-vim9-script

Basically if you add

def! Hello()
    echo "hello world"
enddef

to a regular legacy vim file (.vimrc, for example), function Hello is 
globally defined and one can :call Hello() and get echoed "hello world".

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